Spectrum Math helps reinforce basic and advanced math skills. Age-appropriate lessons are progressive, building on prior material. Chapters feature pre-tests and post-tests, plus mid-tests and a final test, which help track progress. Concepts covered include positive & negative integers, ratios & proportions, algebraic equations & inequalities, geometric problem-solving, probability & statistics. Features a complete answer key. Correlated to current state standards. 160 pages.